Hammer rock-drill.



W. E. KIMBER.

HAMMER ROCK DRILL.

APPLICATION FILED 050.21, 1915.

Patented Jan. 9, 1917.

UNITED STATES PATENT OFFICE WALTER E. KIMBER, OF HARLESDEN, LONDON, ENGLAND.

HAMMER ROCK-DRILL.

Specification of Letters Patent.

Patented Jan. 9, 1917.

Application filed December 27, 1915. Serial No. 68,840.

Rock-Drills, of which the following is aspecification.

The present invention relates to improvements in hammer rock drills and consists in the special arrangement for imparting the desired rotary movement to the bit or tool and also for allowing either water under pressure or compressed air, or a combination of the two, to pass along ahole bored in the bit into the bore hole to allay the dust and remove debris.

The invention enables these objects to be carried into effect in a most simple and eflicient manner, the special construction employed for this purpose being illustrated in the accompanying drawings, in which Figure l is a longitudinal section of the complete drill, and Fig. 2 a similar section, drawn to a larger scale, of the piston or hammer cylinder and the tappet or anvil on which same operates and constituting the chuck carrying the bit or tool.

In these figures 1 is the piston constituting the drill hammer which is mounted to reciprocate in the drill cylinder 2 upon a central rod 3 the opposite ends 4 and 5 of which are made of square or similar section to engage one (4:) with the rear end of the chuck 6 the forward end of which ,receives the stem of the bit or tool 7 while its opposite end (5) engages a rearwardly extending sleeve 8 capable of rotation in relationto the drill cylinder 2 with which it is in axial alinement.

The sleeve 8 extends into a tubular part 9 secured by the clamp 10 ,so-as to constitute part of the frame or support of the drill and which in operation remains stationary, while the sleeve 8 and with it the bit or tool 7 is capable of both rotary and longitudinal movement in relation thereto.

The rear end of the tubular part or drill frame 9 has a spindle 11 mounted therein and fitted with a crank 12 by which same can be manipulated by hand, said spindle extending forward and engaging the sleeve 8 (connected with the rear of the drill cylinder 2) in such a way as to cause same to rotate under the action of said crank. The movement imparted to the crank 12 will be transmitted to the sleeve 8 causing same to rotate within the drill frame 9, and also within the cylinder casing 2 with which: its rear end is connected, said movement in turn belng transmitted through the rod 3 upon which the hammer piston l reciprocates to the bit chulik 6 and so to the bit or tool 7.

The ends of the rod 3 form a slightly loose fit in the recesses in which same engage respectively in the sleeve 8 and the bit chuck so as to permit of any necessary slight adustment to insure alinement and allow of perfect fit and working of the piston hammer l on such rod 3, without throwing excessive strain on the parts when exerting the effective stroke upon the rear of thechuck 6 which constitutes the anvil to receive the blow and transmit it to the bit or tool 7 carried in such chuck. The motive fluid connection and the construction of valve for regulating the distribution of such fluid to the piston cylinder maybe of any known or approved construction.

The drawing shows a piston valve 13, working in a valve casing consisting of two flanged members 20, 20 and a tubular member 20', the parts being held in correct position relatively to one another and the valve chest by a spring 14; said valve 13 controlling the supply of motive fluid entering at 15 to the passages or ports 16, 17, leading respectively to the opposite ends of cylinder 2, in which the piston or hammer 1 is mounted to reciprocate on rod 3, while the cylinder casing 2 is provided with suitably situated exhaust ports 29, 30, which are permanently open to exhaust.

The spindle 11 which extends into the tubular drill frame 9 only engages. the rear part of the sleeve 8 which works therein, a

clearance 18 being left between such spindle and the interior ofthe sleeve-beyond such point of engagement. This space 18 is through passage 19 permanently open to the pressure of the motive fluid in the valve chest 20, and a passage or leakage 21 allows same to pass to the rear of the tubular drill frame- 9. The rear end of the sleeve 8 is provided with packing rings 22 and constitutes a piston working'in the tubular frame 9, and the pressure of the motive fluidexerted on the rear thereof by forcing said sleeve 8, "and with it the drill cylinder casing 2, forward in relation tosuch tubular frame, will keep the dri'll'7 to its work.-

The stem of the bit or tool 7 is provided with a screwed part 23 to engage a corresponding thread in the fore end of the drill chuck 6, and a rearward extension 24 from said screw engages with and abuts against the bottom of a socket formed to receive same in said chuck. The screw thread is to the hand to insure that the rotation imparted to the chuck 6, by hand through the spindle 22 and the central connecting rod 3 when the crank 12 is actuated, will tend to force the bit extension firmly to its seat in the recess it engages.

The compressed air or water under pressure, or both, to be supplied to the bore 25 of the drill 7 for allayin'g the dust and removing the debris from the bore hole is conveyed to an annular recess 26 formed in the part of the casing 2 inwhich the chuck 6 is mounted and is capable of rotary and longitudinal movement, and from which annular recess 26 ahole 27 is pierced inward to the center of the bottom of the socket which the bit extension 24 engages, so that said fluid can'pass into the central hole 25 formed through the length of the bit and so out through openings at the end thereof into the bore hole, thereby allaying the dust and removing the debris therefrom. A squared part 28 on the drill stem forward of the. screwed part 23, by -means of a spanner, permits of the screwing home of the bit to its seat in the chuck, and its release when desired to remove the bit.

It will be understood that the special construction of the chuck and the end of the drill bit as also that for the supply of liquid or compressed air to the bore hole for allaying the dust and removing debris therefrom are not claimed other than in the special construction of drill hereinbefore described in which the piston or hammer is caused to reciprocate on a rod connecting said chuck with a rearward extension of the der and provided with rotating means, a

sleeve slidable and rotatable in said supporting cylinder, engaged by said spindle 2. In a fluid actuated rock drill, the combination of a supporting cylinder, a rotatable spindle disposed axially of saidcylinder. and provided with rotating'means, a

sleeve slidable and rotatable in said support,

ing cylinder, engaged by said spindle and having a forward projection beyond said cylinder, a hammer cylinder mounted on said forward projection of the sleeve and rotatable thereon, a. rotatable bit-carrying chuck in the forward end of said hammer cylinder, a central. rod disposed within said hammer cylinder and connecting said chuck with said sleeve projection, a piston hammerslidable on said rod within said hammer cylinder, means for supplying a motive fluid to said supply means'with said sleeve.

3. In a fluid actuated rock drill, the combination of a hammer cylinder, a' rotatable sleeve connected with the rear end .of said hammer cylinder and provided with an angular socket, a rotatable bit-carrying chuck in the forward end of said hammer cylinder and provided with an angular socket, a central rod having angular opposite ends engaging said sockets with a loose fit which permits an alining adjustment, and a piston hammer cylinder, and means connecting said hammer slidable on' said rod within said hammer cylinder.

In testimony whereof I have signed my name to this specification in the presence 0 two subscribing witnesses.

W. E. KIMBER.

Witnesses:

CHAs. A. ALLISON,

WILLIAM JAMES TERRY. 

